It is possible to make the caption and/or the author visible on the thumbnails of a Gallery, but how can I make it possible on the Lightbox ?
I would like to have the caption visible under the image and, even more if possible, with a link to another page or anchor (for example an item shop page
We don’t currently support displaying captions and authors on a single Image lightbox.
However, you could build this by using a Modal. Simple drop in an Image as the modal trigger, and then place whatever content you want inside the Modal content dropzone (in your case just an Image and some Text).
Hope that helps 
Ben it’d be great if you could please add captions to the lightbox.
If you’re focusing into an image - it’s logical that you’re interested in what it is